Posted by Marc-Andre Bazergui (bazmarc) March 08, 2019 ROBOT REMIX #6 Share Get link Facebook Twitter Pinterest Email Other Apps Post a Comment
The omniwheel is something that I probably shold've mentioned in my description. It's not LEGO, but it's something that I would dearly love to see LEGO manufacture. Given the constraints of designing a compact and robust robot, I found that a dolly wheel was not nearly as effective as an omniwheel.
The board sitting on the NXT is a Wiltronics RoboBall Compass sensor (http://www.wiltronics.com.au/news.php?newsid=6). They're very commonly used in RoboCup Junior Australia.
Wide FOV can certainly be an issue with both the RCX and NXT light sensors. What alternatives would you suggest for vision?
The cables from the Dribbler version were ones that I built following Philo's instructions (http://www.philohome.com/nxtplug/nxtplug.htm).
As to the wide FOV, you can always narrow it with structures. For the old-style RCX light sensor, one technique ("technic"? ;-) ) was to aim the phototransistor through the hole in a 1x2 Technic brick, or to overwise construct "blinders" out of plates or bricks. I've not tried this on the NXT version yet (haven't needed to), but I probably will when I get back to detailed line-following.
I'd love to see videos of the dribbler in action.
The best thing about this particular omniwheel is that a pair of LEGO bushings just happen to fit snugly within the central shaft. A small amount of pressure was required to get them in there, but with an axle to help guide and align the bushings, and a table top to press against, I've now go a LEGO-friendly omniwheel. There's no wiggle on the bushings/axle and I didn't need any glue. (I'd better not want to get those bushings back out though...)
I haven't used it as a drive wheel (yet), but I think it will work for this quite nicely.
It didn't occur to me to include a video (duh!). I'll put that on my 'to do' list as well... along with the building plans...